Resistant material



Patented Oct. 21, v

'4 ed as to be resistant to the growth of fungus UNIT-ED STATES;

mazsa rarsurorrlcs FRANK a. m cnmmorr, or CLAYMONT, AND FOREST J. FUNK, or winmne ron, "DELA- WARE, ASSIGNORS 'ro E. I. no Pom: DE-NEMOURS -& DELAWARE, a CORPORATION OF nnnnwann COMPANY, OF wILmne'ron,

RESISTANT no Drawing. Application filed-April a,

This invention relates to resistant mate-f" j ticles is, so great that the solution willnot readily actually" penetrate, and wet, the

rial and more particularly to fabric so treatand,-preferably,-waterproof and also resist terial for mine ventilating tubing, although not confined to such use. It is an objectof.

'it does "not appreciably retard-the -germithe invention to provide material having the 19 indicated, and other, desirable characteristics; it is also an object toprovide mine'ventilating tubing having such characteristics, and it is a further object to 'rovide a process for the production of such material. To

. these ends, and also to improve generally upon materials and tubing of the character indicated, the invention consists in the various matters hereinafter described and claimed A material for mine ventlating tubing has heretofore been described, such material consisting of fabric coated with a rubber having fungicidal and acid-resistant substances therein, U. S. Patent N0..1,4:32, 585,-

Abraham, October 17, 1922, and suchmaterial is, in many instances, satisfactory. However, further experience has indicated that such material is susceptible of improvement, both as to the incor oration of the fungicide and the character 0 the fungicide. In particular,

it has been found highly desirable to take special precautions against the possibility of mold growth in" the fabric, to make the coating tough, and to use fungicides of somewhat diiferent character from those sug-v gested by Abraham. The present invention comprises a coated fabric embodying advantageous features of the type suggested.

In accordance with the present invention, the fabric itself, prior to coating, is thor-. oughly impregnated with fungicide, such a fungicide being used that itmay be applied in a solution that will thoroughly and actu-' ally penetrate the fibers of the fabric, leaving an ample deposit of fungicide actually in the fibers. This treatment guards against 7 the possibility of the rubber coating not sufant to acid and to fire.- The' present fabric finds particularly advantageous use as -ma--' 1925} serial streams.

solution and the size of the compound parnation of spores reaching the fabric through to manufacture, which may occur in the coating. jAgain,'. the treating of the fabric itself .with fungicide gives to fabric coated upon but one side usefulness in locationswhere metal saltsof organic acids, having anti- 1 septic -'p'roperties.

A Examples of these are zincr salicylate and zinc benzo'ate, but others will ofcourse, suggest themselves. How- 'ever iii-"using others, suitable caution should ,be observed; for example, copper salts, on

account of their oxygen-carrying possibilities, should,-'. if used in connection with a coating of rubber, beused with care, and if silver salts are used due regard must be given to their cost. A high water solubility is best avoided as it results in rapid removal slight initial defects,- or cracks subsequent v of the fungicides by mine waters; but some water solubility is desirable: samples under test show that'water-soluble salts, dissolving into the water surrounding the sample inhibit the germination of mold spores in a zone immediately surrounding) the sample. In other words, a =water-solu le fungicide will diffuse into water when the treated fabric is dampened,and suppress the growth of molds. A water-insoluble fungicide will not do this, although it may be effective in preventing the growth of the mold in the portion of the materiale. g., thelcoating-in which it is included. -Where the'coating is of-rubber, s'uch salts. as have any material deteriorating effect on rubber should preferablybe avoided. a

of the material may "tress Relates.

ya a

- own weight of solution.

tion, the material should 'not be mangled but (parts y Weight) m y be as follows C ude rubbers.

carried out as follows :A 2 (by weight) solution of zinc salicylate is prepared by dissolving the salt in water. The fabric, for example duck, a drill, or an Osnaburg, preferably more than eight ounces to the square yard in weight, is soaked in this solution in any suitable container, preferably by passing the material several times through the solution until it is thoroughly saturated, for example has absorbedsubs tantially its After impregnashould beplaced in a suitable dryrr directly from the bath. Conveniently, a large drum heated on the inside with steam coils may be used as a dryer; This treatment gives substantially 2 of zinc salicylate in the fabric, based on the weight of the fabric. Generally speaking. at least 1% ofrzinc salicylate, based on the weight of the fabric,

is desirable for beneficial effect, while the -maximum percent usable will be governed by appearance, method of application, and like factors.

The impregnation completed, a suitable rubber composition is applied, to one or bothsides of the fabric, preferably both. the early applications of the composition being driven into the fabric, so well as may be, and then a sufiicientquantity spread on the fabric to render the material waterproof. The early applications may be applied by a two-roll type of impregnator so-called, -and the a later ones by means of a regular spreading machine until the desired weight of coating is obtained to render the material waterproof.

By way ofexample, a suitable composition 25 Litharge 8 Sulphur Barytes 52% Zinc salicylate 2 Pine tar 4 Paraflin 7% It will be understood that the above is but a specimen formula, and that it may be con siderably varied without departure from .the invention. For instance, the percentage of rubber can be varied from a very small percentage up to almost 100%, the litharge and sulphur varying with the rubber. The zinc salicylate. or the pine tar, or both, can be omitted if it should for any reason be desirable, the omitted fungicide being replaced by an equal amount of barytes. The parallin may range from to 10% of the total weight of the ingredients of the composition. The zinc'salicylate to be appreciably beneficial, should be used to the extent of at least 1% of the composition, and any greater amount desired may be used so long as the physical (lb characteristics of the coating, its ease of application, and the like, are not objectionably affected. As to the pine tar, assuming it to have a phenol coefficient of 1, at least 1% should be used for substantial effect, the maximum amount usable depending on considerations-such as those mentioned in"c on-' nect1on with the zinc sal1cylate. In uslng the composition it is dissolved in an equal weight of gasoline.

Afterthe coating, tale is applied to the coating to prevent sticking, and then the material is festooned in a suitable vulcaniz-v ing chamber and the heater closed. In vulcanizmg, the temperature is carried to about 250 F. in the first-hour and this temperature is maintained for about two andonehalf hours, completing the vulcanizing. 'This completes the manufacture of the material.

rial coated upon but one side is used such side should constitute the ,outer or exterior,

side of the tubing. The paraffin in the composition gives it resistance to the dilute acids In making mine ventilating tubing, the material may be cut to size andmade up in .the usual ways of the art, and where mateticular circumstance, the acid resistant, or

the fire resistant, or both, may be omitted to meet the particular desires of the user of I the material. If desired, the fabric itself may be treated with pine tar, or similar fungicide, but the slightly water-soluble salts are preferable as above indicated.

1.- As anarticle of'manufacture, fungus resistant material comprising a fabric base,

the fibers of the fabric being impregnated with an organic salt'of zinc having substantial fungicidal properties m-an amount equal -to at least 1% based on the weight of the fabric and a water solubility approximately that of zinc salicylate and zinc benzoate, and said base being coated with a waterprloofing composition also containing said sat. I 2. As an article of manufacture, fungus resistant material comprising a fabric base, the fibers of the fabric being impregnated with zinc'salicylate,,and havinga coating of vulcanized rubber. I

3. As an article of manufacture, fungus resistant material comprising a fabric base, the fibers of the fabric being impregnated with zinc salicylate, in an amount equal to at least 1% based on the weight of the fabric,

and having acoating off-vulcanized rubber containing fungus, fire, and acid resistant ingredlents.

4.' As an article of manufacture, fungus a Water solubility approximately that of zinc salicylate and. zinc benzoate, and said base being coated with a Waterproofing composition.

5. As an article of manufacture, fungus resistant material comprising a fabric base, the fibers of .the fabric beingximpregnated with a heavy metal salt of an organic acid having substantial fungicidal pro erties; and a Water solubility approximately t at of; zinc salicylate and 'zinc benzoate, and said base. being coated with a waterproofing composition. primarily of rubber and being "strongly resistant to the action of fungi. 1

' sistant material, which comprises impregnate 6. The process of producing a fungus reing the fibers of'a fabric with a fabric-wetting solution of a slightly water soluble organic salt of zinc having substantial fungicidalproperties, depositing the fungicide in the fibers ofthe fabric, and coatingthe fabric with a rubber" waterproofing composition.

7. The process of producing a fungusproof and waterproof rubber-coated fabric which comprises impregnating thefibers of a fabric with a solution containin not less than 1% by weight based on the fa ric, of a slightly Water soluble non-volatile heavy metal salt of an organic acid having substantial fungicidal properties, heating to evapo rate the solvent and to deposit the fungicide in the fibres of the fabric,,and coating the dried fabric with a rubber composition.

j In testimony whereof we aflix our sigma tures. n

FRANK A. MGDERMOTT.

FOREST J. FUNK. 

